The billing method for mobile over-the-counter traffic is mainly based on the amount of traffic that exceeds the amount included in the package. Specifically, when the user's traffic exceeds the fixed amount of traffic included in the package, the excess will be billed at a specific unit price. Currently, China Mobile's out-of-set traffic charge is RMB 0.29 for every MB of traffic in excess of 1MB. When a user's out-of-set traffic cost reaches RMB 60, billing will be suspended and the user will be allowed to use 1GB of out-of-set traffic for free, which is equivalent to providing the user with a certain traffic buffer. When this 1GB of traffic is used up, billing will continue again at the rate of $0.29 per 1MB. This billing method helps users to better control the cost of traffic usage and avoid unnecessary expenses. At the same time, users can also choose the right type of package to meet different traffic needs based on their usage.